Search for dissertations about: "piezoelectric"

Showing result 1 - 5 of 93 swedish dissertations containing the word piezoelectric.

  1. 1. Melt spun piezoelectric textile fibres an experimental study

    University dissertation from Chalmers University of Technology

    Author : Anja Lund; Högskolan i Borås.; Högskolan i Borås.; [2013]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Textil och mode generell ; Textiles and Fashion General ; poly vinylidene fluoride ; PVDF; fibre; piezoelectric polymer; smart textile; melt spinning; crystal structure; X-ray diffraction of polymers; Smart textiles; Piezoelectricity; Fibres; Sensor; Textile; Smart textile; Yarn; piezoelectric;

    Abstract : Melt Spun Piezoelectric Textile Fibres - an Experimental Study ANJA LUND Department of Materials and Manufacturing Technology Chalmers University of Technology ABSTRACT The manufacturing and characterisation of piezoelectric textile fibres are described in this thesis. A piezoelectric material is one that generates an electric voltage when deformed, a property which exists in a number of materials. READ MORE

  2. 2. Piezoelectric Generation and Damping of Extensional Waves in Bars

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Anders Jansson; Uppsala universitet.; [2007]
    Keywords : Technology; Piezoelectric; wave; generation; damping; bar; TEKNIKVETENSKAP;

    Abstract : This thesis focuses on the electromechanical processes of generation and damping of transient waves in bars with attached piezoelectric members. In particular, the influence of amplifier and electrical circuitry on the mechanical waves is of interest. READ MORE

  3. 3. Energy Harvesting and Energy Storage for Wireless and Less-Wired Sensors in Harsh Environments

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Elof Köhler; [2018]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Thermoelectric; Thermoelectric harvester; harsh environment; piezoelectric harvester; supercapacitor; coupled harvester; Piezoelectric; Energy harvester;

    Abstract : Engineering requires sensors to control and understand the environment. This is particularly important in harsh environments. The drawbacks, especially in gas turbines is the complexity of installing a wired sensor and the weight of the wires. This makes wireless sensors attractive. READ MORE

  4. 4. Energy Harvesting for Wireless and Less-Wired Sensors in Gas Turbines

    University dissertation from ; Chalmers tekniska högskola; Gothenburg

    Author : Elof Köhler; [2019]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; coupled harvester; piezoelectric harvester; piezoelectric; Energy harvester; thermoelectric harvester; harsh environment; thermoelectric; self-tuning;

    Abstract : Four types of energy harvesters aimed for gas turbine applications were developed during this thesis. The unique gas turbine environment shaped the design- and material choices. A semiconductor thermoelectric harvester was built for a location in the gas turbine with active cooling at 600°C, with 800°C wall temperature. READ MORE

  5. 5. Melt spinning of poly(vinylidene fluoride) mono- and bicomponent fibres and yarns : the formation of piezoelectric beta-phase crystallinity

    University dissertation from Chalmers University of Technology

    Author : Anja Lund; Högskolan i Borås.; [2010]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fibres; PVDF; Textilteknologi; piezoelectric polymer; poly vinylidene fluoride ; processing conditions; crystal structure; X-ray diffraction of polymers; fibre; melt spinning;

    Abstract : The present study investigates the possibilities of manufacturing piezoelectric polymer fibres or yarns for integration into textile materials. The polymers known to give the strongest piezoelectric effects are poly(vinylidene fluoride) (PVDF) and some of its copolymers. READ MORE